I've never cycled more than 65 miles in a day (did that in 4 hours) on my road bike.
I've always wanted to do the C2C route "Way of the Roses". It's 170 miles. I could do it in 3 days but I reckon on my own I'd get a bit bored only doing 55 miles a day and the extra accommodation cost (I am not camping) puts me off too.
So I want to do it in 2 days. 85 miles a day. Get train to Morecombe, ride to Ripon (isH), ride to Brid the next day then train home.
I figure that these things should be a challenge. I'm getting older and if I keep thinking "I'll do it when I get a bit fitter" I'll never do it. I worry about stuff before it happens (I like to plan ahead) but once I'm in it I will be determined.
SO it's a good idea, right? Better try it and fail than never bother.....